GO₂NE Webinar on Ocean Deoxygenation. 

"Do you want to know more about deoxygenation in the ocean?
Join us for the upcoming webinar!

Wednesday, 11th October 2023, 16:00 h – 17:00 CEST

Registration link

Please join the Global Ocean Oxygen Network (IOC Expert Working Group GO2NE) for a new session of its webinar series on ocean deoxygenation. The 23rd webinar will take place 11 October 2023, 16:00 h CEST. The webinar will feature presentations by a more senior and an early-career scientist, 20 minutes each followed by 10 minutes moderated discussion sessions. 

If you are interested to present at one of the upcoming webinars please submit a short abstract here.

Moderation: 
Dimitri Gutierrez 
Instituto del Mar del Perú (IMARPE)

Speakers:
Montserrat Aldunate 
Universidad de Concepción, Chile
"Effect of the oxygen minimum zone on eukaryotic and prokaryotic phytoplankton of the Eastern Tropical North and South Pacific Ocean"

Michelle Graco 
Instituto del Mar del Perú (IMARPE)
"A Long-term Marine-coastal Observatory of low oxygen and acidification in the upwelling system off Peru"

If you want to receive further information about upcoming webinars please register here." 

Abstract.

"Oxygen is a key indicator of ecosystem health and part of environmental assessments used as a tool to achieve a healthy ocean. Oxygen assessments are mostly based on monitoring data that are spatially and temporally limited, although monitoring efforts have increased. This leads to an incomplete understanding of the current state and ongoing trends of the oxygen situation in the oceans. Ocean models can be used to overcome spatial and temporal limitations and provide high-resolution 3D oxygen data but are rarely used for policy-relevant assessments. [...]".

Source: Biogeosciences
Authors: Sarah Piehl et al.
DOI: https://doi.org/10.5194/bg-2023-152

Read the full article here.

Abstract.

"An approach was developed to help evaluate and predict the combined effects of ocean acidification and deoxygenation on calcifying organisms along the coast of Japan. The Coastal and Regional Ocean COmmunity (CROCO) modeling system was set up to couple the Regional Ocean Modeling System (ROMS) to the Pelagic Interaction Scheme for Carbon and Ecosystem Studies (PISCES) biogeochemical model and used to reproduce physical and biochemical processes in the area around Miyako Bay, Iwate Prefecture, Japan. [...]".

Source: Frontiers in Marine Science
Authors: Lawrence Patrick C. Bernardo et al.
DOI: https://doi.org/10.3389/fmars.2023.1174892

Read the full article here.

Abstract.

"Dissolved oxygen and current observations from a cabled ocean observatory in the Sea of Oman show that the annual recurrence of coastal hypoxia, defined as dissolved oxygen concentrations ≤63 μM, is associated with the seasonal cycle of local monsoon winds. The observations represent the first long-term (5+ years) continuous moored observations off the northern Omani coast. During the summer/fall southwest (SW) monsoon season (Jun-Nov), winds in the Sea of Oman generate ocean currents that result in coastal upwelling of subsurface waters with low dissolved oxygen concentrations. [...]".

Source: Frontiers in Marine Science
Authors: Steven F. DiMarco et al.
DOI: https://doi.org/10.3389/fmars.2023.1248005

Read the full article here.

Abstract.

"The French coast facing the Bay of Biscay (north-east Atlantic) is characterised by the presence of small macrotidal and turbid estuaries, including the Charente, geographically located between the two large estuaries of the Gironde and the Loire (south-west France). Multi-year, multi-site, high-frequency water quality surveys have shown that the Loire, and to a lesser extent the Gironde, suffer from summer hypoxia. These observations raised the question of the possible occurrence of hypoxia, particularly in one of these small estuaries, the Charente, which flows into the Bay of Marennes-Oléron, the first oyster-producing area in France. [...]".

Source: Biogeosciences
Authors: Sabine Schmidt & Ibrahima I. Diallo
DOI: https://doi.org/10.5194/bg-2023-150

Read the full article here.

Abstract.

"Sea-level changes exert an important control on oceanic circulation and climate evolution. Researchers have proposed that sea-level rise favored accumulation of sediments enriched in organic carbon during oceanic anoxic events (OAEs), although high-frequency sea-level changes and their controlling mechanism have remained poorly constrained. Here we present a detailed sedimentological and geochemical study on Aptian (Lower Cretaceous) shallow-water carbonates of the Dariyan Formation exposed in the Zagros fold belt of southern Iran. [...]".

Source: Science Direct
Authors: Yiwei Xu et al.
DOI: https://doi.org/10.1016/j.gloplacha.2023.104236

Read the full article here.

Abstract.

"The Cryogenian Sturtian and Marinoan Snowball Earth glaciations bracket a nonglacial interval during which Demosponge and green-algal biomarkers first appear. To understand the relationships between environmental perturbations and early animal evolution, we measured sulfur and mercury isotopes from the Datangpo Formation from South China. Hg enrichment with positive Δ¹⁹⁹Hg excursion suggests enhanced volcanism, potentially due to depressurization of terrestrial magma chambers during deglaciation. [...]".

Source: Science Advances
Authors: Menghan Li et al.
DOI: 10.1126/sciadv.adh9502

Read the full article here.

Abstract.

"This study examines the linkages between the upper ocean (0–200 m) oxygen (O₂) content and stratification in the North Pacific Ocean in four Earth system models (ESMs), an ocean hindcast simulation, and ocean reanalysis data. Trend and variability of oceanic O₂ content are driven by the imbalance between physical supply and biological demand. The physical supply is primarily controlled by ocean ventilation, which is responsible for the transport of O₂-rich surface waters into subsurface. To quantify the ocean ventilation, Isopycnic Potential Vorticity (IPV) is used as a dynamical proxy in this study. [...]".

Source: Biogeosciences
Authors: Lyuba Novi et al.
DOI: https://doi.org/10.5194/bg-2023-129

Read the full article here.

Abstract.

"Marine hypoxia has had major consequences for both economically and ecologically critical fish species around the world. As hypoxic regions continue to grow in severity and extent, we must deepen our understanding of mechanisms driving population and community responses to major stressors. It has been shown that food availability and habitat use are the most critical components of impacts on individual fish leading to observed outcomes at higher levels of organization. However, differences within and among species in partitioning available energy for metabolic demands – or metabolic prioritization – in response to stressors are often ignored. [...]".

Source: Frontiers in Marine Science
Authors: Elizabeth Duskey
DOI: https://doi.org/10.3389/fmars.2023.1206506

Read the full article here.

Abstract.

"EMB Future Science Brief No. 10 highlights the most recent science on Ocean oxygen, including causes, impacts and mitigation strategies of Ocean oxygen loss, and discusses whether “every second breath we take comes from the Ocean”. It closes with key policy, management and research recommendations to address Ocean deoxygenation and communicate more accurately about the role of the Ocean in Earth’s oxygen. 
The sentence “every second breath you take comes from the Ocean” is commonly used in Ocean Literacy and science communication to highlight the importance of Ocean oxygen. [...]".

Source: European Marine Board
Authors: Marilaure Grégoire et al.
DOI: 10.5281/zenodo.7941157

Read the full article here.